Efficiency: This is one of the cheapest methods of clearing the board in Hearthstone. For 2 actual mana cost, this card does 2 mana value in damage to every enemy (including the opposing Hero). Therefore, this card has a very high mana efficiency.

Uses and Tactics:

Enemies will often predict that this is the Secret that you are playing since it is so common. Try to create situations where they have to attack your Hero and destroy all of their minions. Otherwise, the enemy may make more favorable trades before activating your trap.

This card greatly benefits from additional Spell Damage.

Try to damage as many minions as possible with Explosive Trap to increase the mana efficiency.